高强亚稳β钛合金变形机制及其组织调控方法

李金山, 唐斌, 樊江昆, 王川云, 花珂, 张梦琪, 戴锦华, 寇宏超

Deformation Mechanism and Microstructure Control of High Strength Metastable β Titanium Alloy

LI Jinshan, TANG Bin, FAN Jiangkun, WANG Chuanyun, HUA Ke, ZHANG Mengqi, DAI Jinhua, KOU Hongchao

图3 亚稳β钛合金中细密α相多层级组织特征[30,31] (a) EBSD map illustrating the microstructure of Ti-5553 alloy containing all Burgers orientation relationship (BOR) α variants (b) pole figures of β matrix and α variants in Fig.3a (c) TEM micrograph presenting ternary α variants indicated by white, red, and blue, respectively (The image was conducted along <111> zone axis with varied g vector selected for dark field (DF) condition as shown in the inserted diffraction pattern) (d) pyramidal arrangement of α vriants[30] (e) DF TEM image of microstructure containing dense α precipitates (This micrograph was obtained using a/2 <112> spot highlighted in the corresponding diffraction pattern along <11ˉ0> zone axis. A square area of 1 μm2 was inserted to ease the quantitative investigation on the density of nano-precipitates)[31]

Fig.3 Microstructural features of hierarchical dense α phase in metastable β titanium alloys